i have one system with R20A-2 and two C313-2 .The one C313-2 works wifi only with power and i want to control the relay to the other c313-2 via wifi  to open the door because i open the door only via the one monitor that has cable to the door lock ...the R20a-2 has not cables to the lock thats why i want to open the door via the other monitor that has cables